| antiproton | (noun) an unstable negatively charged proton; the antiparticle of a proton | - |
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| croton | (noun) tropical Asiatic shrub; source of croton oil | Synonyms: Croton tiglium |
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| (noun) grown in many varieties for their brightly colored foliage; widely cultivated as a houseplant | Synonyms: Codiaeum variegatum |
| kiloton | (noun) one thousand tons | - |
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| (noun) a measure of explosive power (of an atomic weapon) equal to that of 1000 tons of TNT | - |
| photon | (noun) a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle | - |
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| polyptoton | (noun) repetition of a word in a different case or inflection in the same sentence | - |
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| proton | (noun) a stable particle with positive charge equal to the negative charge of an electron | - |
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